The animals themselves. Don't be suprised if you see black or white squirrles.They're really gray squirrels with a color variation.

Sounds: Red squirrels are loudest, with their sometimes birdlike,sometimes scolding, but seemingly endless chatter. Gray and fox squirrels also chatter, and during th mating season, they'll make a chucking bark as they chase each other. You may hear chewing,pattering,scampering,scratching sounds in attic, eaves and walls from early morning throughout the day-unless the resident are flying squirrels, which are nocturnal.

Scat: Oval, smooth, roughly ¼ inch long. The scat of flying squirrels is often found in distinctive piles.

Nest: Gray,fox and flying squirrels make leaf nests, usually placed in a tree crotch, that are used summer and fall.

Evidence of their feeding: Mipped twigs of spruce,hemlock, and pine trees; piles of gnawes nuts (acorns) between attic joist or in wall voids.